/*
 * Copyright (C) 2010 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.mylhyl.zxing.scanner.decode;

import android.content.res.Configuration;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.PlanarYUVLuminanceSource;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.common.GlobalHistogramBinarizer;
import com.mylhyl.zxing.scanner.camera.CameraManager;
import com.mylhyl.zxing.scanner.common.Scanner;

import java.io.ByteArrayOutputStream;
import java.util.Map;

final class DecodeHandler extends Handler {

	private final CameraManager cameraManager;
	private final Handler scannerViewHandler;
	private final MultiFormatReader multiFormatReader;
	private boolean running = true;
	private boolean bundleThumbnail = false;

	DecodeHandler(CameraManager cameraManager, Handler scannerViewHandler, Map<DecodeHintType, Object> hints, boolean
		bundleThumbnail) {

		this.cameraManager = cameraManager;
		this.scannerViewHandler = scannerViewHandler;
		this.bundleThumbnail = bundleThumbnail;
		multiFormatReader = new MultiFormatReader();
		multiFormatReader.setHints(hints);
	}

	@Override
	public void handleMessage(Message message) {

		if (message == null || !running) {
			return;
		}
		switch (message.what) {
		case Scanner.DECODE:
			decode((byte[]) message.obj, message.arg1, message.arg2);
			break;
		case Scanner.QUIT:
			running = false;
			Looper.myLooper().quit();
			break;
		}
	}

	/**
	 * 捕捉画面并解码<br/>
	 * Decode the data within the viewfinder rectangle, and time how long it
	 * took. For efficiency, reuse the same reader objects from one decode to
	 * the next.
	 *
	 * @param data
	 * 	The YUV preview frame.
	 * @param width
	 * 	The width of the preview frame.
	 * @param height
	 * 	The height of the preview frame.
	 */
	private void decode(byte[] data, int width, int height) {
		//竖屏识别一维
		if (cameraManager.getContext().getResources().getConfiguration().orientation ==
			Configuration.ORIENTATION_PORTRAIT) {
			byte[] rotatedData = new byte[data.length];
			for (int y = 0; y < height; y++) {
				for (int x = 0; x < width; x++)
					rotatedData[x * height + height - y - 1] = data[x + y * width];
			}
			int tmp = width;
			width = height;
			height = tmp;
			data = rotatedData;
		}
		Result rawResult = null;
		PlanarYUVLuminanceSource source = cameraManager.buildLuminanceSource(data, width, height);
		if (source != null) {
			BinaryBitmap bitmap = new BinaryBitmap(new GlobalHistogramBinarizer(source));
			try {
				rawResult = multiFormatReader.decodeWithState(bitmap);
			} catch (ReaderException re) {
				// continue
			} finally {
				multiFormatReader.reset();
			}
		}

		Handler handler = scannerViewHandler;
		if (rawResult != null) {
			if (handler != null) {
				//会向 ScannerViewHandler 发消息
				Message message = Message.obtain(handler, Scanner.DECODE_SUCCEEDED, rawResult);
				Bundle bundle = new Bundle();
				if (bundleThumbnail)
					bundleThumbnail(source, bundle);
				message.setData(bundle);
				message.sendToTarget();
			}
		} else {
			if (handler != null) {
				Message message = Message.obtain(handler, Scanner.DECODE_FAILED);
				message.sendToTarget();
			}
		}
	}

	private static void bundleThumbnail(PlanarYUVLuminanceSource source, Bundle bundle) {

		int[] pixels = source.renderThumbnail();
		int width = source.getThumbnailWidth();
		int height = source.getThumbnailHeight();
		Bitmap bitmap = Bitmap.createBitmap(pixels, 0, width, width, height, Bitmap.Config.ARGB_4444);
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		bitmap.compress(Bitmap.CompressFormat.JPEG, 50, out);
		bundle.putByteArray(DecodeThread.BARCODE_BITMAP, out.toByteArray());
		bundle.putFloat(DecodeThread.BARCODE_SCALED_FACTOR, (float) width / source.getWidth());
	}
}
